// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

//go:build !windows

package fileutil

import (
	"os"

	"golang.org/x/sys/unix"
)

func mmap(fd int, offset int64, size, mode int) ([]byte, error) {
	var prot int
	if mode&read != 0 {
		prot |= unix.PROT_READ
	}

	if mode&write != 0 {
		prot |= unix.PROT_WRITE
	}

	data, err := unix.Mmap(fd, offset, size, prot, unix.MAP_SHARED)
	return data, err
}

func munmap(_ *os.File, data []byte) error {
	return unix.Munmap(data)
}

func msync(data []byte) error {
	return unix.Msync(data, unix.MS_SYNC)
}
